Summary of Significant Accounting Policies (Details) $ in Thousands		3 Months Ended			6 Months Ended
	Jan. 01, 2020 USD ($)	Jun. 30, 2020 USD ($)		Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) segment shares		Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Due from Tenants, not probable of collection					$ 41,000
Operating Segments
Number of Reportable Operating Segments | segment					2
Revenue Recognition [Abstract]
Straight Line Rent					$ 7,500		$ 1,400
Straight line rent write off		$ 13,000			13,000		5,600
Percentage rents					4,200		5,500
Concentrations of Risk [Abstract]
Rental revenue		97,531		$ 147,003	232,574		287,295
Share-based Payment Arrangement, Noncash Expense [Abstract]
Share-based payment arrangement, noncash expense included in severance							100
Financing Receivable, Allowance for Credit Loss	$ 2,163	6,839		0	6,839		0
Provision for Loan, Lease, and Other Losses					4,676
Financing Receivable, Credit Loss, Expense (Reversal)		3,484		0	4,676		0
Deferred Costs		35,900			35,900			$ 37,200
Prepaymentfee					0		900
Recovery of Direct Costs					7,000		7,600
Rent Abatements					4,900
Rent Concessions					3,800
Deferred Rent Receivables, Net		60,000			60,000
Loans and Leases Receivable, Deferred Income		3,500			3,500
Asset Impairment Charges		51,264		0	51,264		0
Equity Method Investment, Other than Temporary Impairment		3,247		0	3,247		0
Line of Credit, Current		750,000			$ 750,000
Number of common shares repurchased | shares					4,066,716
Treasury Stock, Value, Acquired, Cost Method					$ 106,000
number of theatres in entertainment districts | segment					7
American Multi-Cinema, Inc. [Member]
Concentrations of Risk [Abstract]
Rental revenue					$ 22,144		$ 61,364
Percentage of lease revenue in total revenue					8.60%		18.00%
TopGolf [Member]
Concentrations of Risk [Abstract]
Rental revenue					$ 40,129		$ 37,719
Percentage of lease revenue in total revenue					15.60%		11.10%
Regal [Member]
Concentrations of Risk [Abstract]
Rental revenue					$ 39,099		$ 32,620
Percentage of lease revenue in total revenue					15.20%		9.60%
Share Options [Member]
Share-based Payment Arrangement, Noncash Expense [Abstract]
Share based compensation, future vesting period minimum (in years)					4 years
Stock-option expense					$ 6		$ 5
Restricted Stock [Member]
Share-based Payment Arrangement, Noncash Expense [Abstract]
Share based compensation expense related to employees and trustees					$ 5,400		5,600
Restricted Stock [Member] | Minimum [Member]
Share-based Payment Arrangement, Noncash Expense [Abstract]
Share based compensation, future vesting period minimum (in years)					3 years
Restricted Stock [Member] | Maximum [Member]
Share-based Payment Arrangement, Noncash Expense [Abstract]
Share based compensation, future vesting period minimum (in years)					4 years
Performance Shares [Member]
Share-based Payment Arrangement, Noncash Expense [Abstract]
Share based compensation, future vesting period minimum (in years)					3 years
Share based compensation expense related to employees and trustees					$ 500
Restricted Share Units [Member] | Non-Employee Trustees [Member]
Share-based Payment Arrangement, Noncash Expense [Abstract]
Share based compensation expense related to employees and trustees					1,000		900
Revolving Credit Facility [Member]
Share-based Payment Arrangement, Noncash Expense [Abstract]
Deferred Costs		4,300			4,300			$ 3,500
triple-net lessor costs [Member]
Share-based Payment Arrangement, Noncash Expense [Abstract]
Recovery of Direct Costs					900		4,300
Discontinued Operations, Disposed of by Sale [Member]
Revenue Recognition [Abstract]
Straight Line Rent							1,200
Straight line rent write off							900
Trade Accounts Receivable [Member]
Revenue Recognition [Abstract]
Straight line rent write off		5,000			5,000
Ground Lease Arrangement [Member]
Revenue Recognition [Abstract]
Straight line rent write off		8,000			8,000
Mortgage Receivable [Member]
Share-based Payment Arrangement, Noncash Expense [Abstract]
Financing Receivable, Allowance for Credit Loss	2,000	6,422			6,422
Provision for Loan, Lease, and Other Losses					4,422
Notes Receivable [Member]
Share-based Payment Arrangement, Noncash Expense [Abstract]
Financing Receivable, Allowance for Credit Loss	49	230			230
Provision for Loan, Lease, and Other Losses					$ 181
Building [Member] | Minimum [Member]
Share-based Payment Arrangement, Noncash Expense [Abstract]
Property, Plant and Equipment, Useful Life					30 years
Building [Member] | Maximum [Member]
Share-based Payment Arrangement, Noncash Expense [Abstract]
Property, Plant and Equipment, Useful Life					40 years
Furniture, fixtures & equipment [Member] | Minimum [Member]
Share-based Payment Arrangement, Noncash Expense [Abstract]
Property, Plant and Equipment, Useful Life					3 years
Furniture, fixtures & equipment [Member] | Maximum [Member]
Share-based Payment Arrangement, Noncash Expense [Abstract]
Property, Plant and Equipment, Useful Life					25 years
Building Improvements [Member] | Minimum [Member]
Share-based Payment Arrangement, Noncash Expense [Abstract]
Property, Plant and Equipment, Useful Life					10 years
Building Improvements [Member] | Maximum [Member]
Share-based Payment Arrangement, Noncash Expense [Abstract]
Property, Plant and Equipment, Useful Life					20 years
Retained Earnings [Member]
Share-based Payment Arrangement, Noncash Expense [Abstract]
Financing Receivable, Credit Loss, Expense (Reversal)	2,200
Retained Earnings [Member] | Mortgage Receivable [Member]
Share-based Payment Arrangement, Noncash Expense [Abstract]
Financing Receivable, Credit Loss, Expense (Reversal)	2,100
Retained Earnings [Member] | Notes Receivable [Member]
Share-based Payment Arrangement, Noncash Expense [Abstract]
Financing Receivable, Credit Loss, Expense (Reversal)	$ 100
Experiential Reportable Operating Segment [Member]
Concentrations of Risk [Abstract]
Rental revenue		84,204		129,271	$ 202,864		253,287
Experiential Reportable Operating Segment [Member] | Real Estate Investment [Member]
Share-based Payment Arrangement, Noncash Expense [Abstract]
Asset Impairment Charges		36,300
Experiential Reportable Operating Segment [Member] | Right-of-Use Assets, Operating Lease [Member]
Share-based Payment Arrangement, Noncash Expense [Abstract]
Asset Impairment Charges		$ 15,009	[1]	$ 0	$ 15,009	[1]	$ 0
Theatre Project China Member
Share-based Payment Arrangement, Noncash Expense [Abstract]
Number of unconsolidated real estate joint ventures		3			3

[1] (3) During the three and six months ended June 30, 2020, the Company recognized impairment charges of $15.0 million related to the operating lease right-of-use assets at two of its properties. See Note 4 for the details on these impairments.